"Gizzard shad are the heartier and more pervasive of the two; they can handle all but the most frigid waters, whereas threadfins will die in water below 40 degrees"
Gizzard Shad appear to be harder to purchase in Texas than the Threadfin.... I wish I could get some of the hardy Gizzards....i think or would the hardy Gizzards overpopulate in a 4 acre pond?